Pennsylvania Route 31
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| Route information | ||||
| Maintained by PennDOT | ||||
| Length: | 74.74 mi (120.28 km) | |||
| Existed: | 1927 – present | |||
| Major junctions | ||||
| West end: |
 PA 136 near West Newton
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 I-70 near Turkeytown US 119 near Mount Pleasant PA 982 in Laurelville  I-70 / I-76 / Penna Turnpike in Donegal PA 711 in Donegal PA 381 near Jones Mills  PA 281 / PA 601 in Somerset PA 160 near Berlin PA 96 near Manns Choice
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| East end: |
 US 30 near Bedford
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| Location | ||||
| Counties: | Westmoreland, Fayette, Somerset, Bedford | |||
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Pennsylvania Route 31 (PA 31) is a 74-mile-long (119 km) state highway located in Western Pennsylvania, paralleling U.S. Route 30 and the Pennsylvania Turnpike for most of its length. The designation begins at PA 136 near West Newton and ends at US 30 near Bedford.
PA 31's designation begins at Pennsylvania Route 136 near West Newton. It travels east, interchanging with Interstate 70. After that interchange, PA 31 does not intersect any more numbered roads until it interchanges U.S. Route 119 in the western part of Mount Pleasant. When PA 31 interchanges US 119, it turns from a two-lane surface road into first a four-lane road, and then into a city street as it goes through Mount Pleasant.
As PA 31 progresses through Mount Pleasant, it forms a concurrency with Pennsylvania Route 981. After that, it intersects Pennsylvania Route 819 before leaving the borough and entering the township.
The first intersection with a numbered road after entering the township is Pennsylvania Route 982. This is the only major intersection until it reaches Donegal. When it does reach Donegal, there is an entrance ramp to the Pennsylvania Turnpike, and immediately following that is the western terminus of the concurrency with Pennsylvania Route 711.
2 miles (3 km) later, PA 31 intersects Pennsylvania Route 381. This marks the eastern terminus of the concurrency with PA 711, and the western terminus of PA 381. It is also the northern terminus of the PA 381/711 concurrency as well. Before leaving Donegal Township, PA 31 approaches the eastern terminus of the concurrency with PA 381. This is the last major intersection before PA 31 winds its way through rural Pennsylvania to Somerset.
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